Pipe-mold.



No. 683,389. Patented Sept. 24, l90l.

B. R. DAVISSON.

PIPE MOLD.

(Application lod Apr. 4, 1900.)

rren y r1-Es PATENT Prion,

BENJAMIN R. DAVISSON, CF DUARTE, CALIFORNIA.

PIPE-MOLD.

SPECIFICATION forming part of Letters Patent No. 683,389, dated September 24, 1901. Application filed April 4, 1900. Serial No. 11.515. (No model.)

T0 otZZ whom it' may concern.'

Be it known that I, BENJAMIN R. DAvIssoN, a citizen of the United States, residing at Duarte, in the county of Los Angeles, State of California, have invented new and useful Improvemen ts in Pipe-Molds, of which the following is a specification.

My invention relates to molds for forming concrete pipe; and the objects thereof are to provide a mold of simple construction that will permit the formation therein of pipe of great density and strength and which can be readily removed from the pipe when completed without collapsing the core, and thereby insure a smooth interior in the pipe. In the manufacture of concrete pipe with the cores heretofore employed difficulty has been encountered in thoroughly compressing the concrete by tamping or pressing, as the cores are collapsible or yielding in order that they may be removed from the concrete when formed, and therefore do not form a suitable inner mold for the concrete when being formed into pipe. This will be obviated by my improved core. I accomplish these objects by the mechanism describedherein and illustrated in the accompanying drawing, forming a part hereof, which is a vertical section of my pipe-mold, showing concrete therein.

A is the outside casing of the mold, which is held together in the usual manner and is provided with handles B. Casing A rests upon bottom block C, which is provided With a round hole D in the center thereof, adapted to fit upon the smaller end of the core E,

which projects a short distance below block C when the mold is in place ready for use to enable the removal of the core when the pipe is removed to the drying-floor. Block C is supported by timber F, which rests upon the ground or fioor G when the pipe is being made. Core E is made with a slight taper from the top to the bottom to permit of its easy Withdrawal from the concrete forming the pipe. I have found in practice one-fourth of an inch taper t0 be amply sufficient in a joint thirty inches long. Core E is made of pass rod I, having A to core E ischime-ring K to form a proper chime on the lower end of the joint of pipe to receive the upper end of the joint of pipe, which is formed into proper shape by Shaper-ring L.

My mold is operated as follows, the parts being assembled as shown in the drawing, except shaper-ring L: Concrete M of proper consistency to make pipe is fed between the casing and the core and is thoroughly tamped. As core' E is a continuous shell, it permits of the concrete being more thoroughly tamped than if made in the usual collapsible form. When the mold is full, an additional quantity of concrete is placed on the top and Shaper-ring L is then put on and the top is formed into proper shape thereby to iit the lower end of another joint, and the joint and mold are then removed to a suitable dryingfloor. Upon setting the mold down upon the drying-licor core E comes in contact therewith and by a gentle pressure of handles Bis started out of the pipe and is removed therefrom by handle J, after which the outer casing is removed in the usual mannerand, together with the core, may be used again. As the core is continuous, the inner side of the pipe is rendered much smoother than with the collapsible core. Pipe made from my mold should be laid from the outlet to the inlet of the line. Having described my invention, what I claim is In a mold for making cement pipe, the combination with a noncollapsible taper core, having its smaller end adapted to project below the end of the mold, of a base-block and an outer casing.

In witness that I claim the foregoingl have hereunto subscribed my name, this 28th day of March, 1900, at Los Angeles, California.

B. R. DAVISSON.

Witnesses:

HENRY T. HAZARD, G. E. HAR-PHAM. 

